N. Limao and A. J. Venables, Infrastructure, Geographical Disadvantage, and Transport Costs; World Bank Economic Review 15, 2001; D. Hummels, Toward a Geography of Trade Costs, University of Chicago, 1999.
N. Limao y A. J. Venables, "Infrastructure, Geographical Disadvantage and Transport Costs", en World Bank Economic Review, Nº 15, 2001; D. Hummels, Toward a Geography of Trade Costs, University of Chicago, 1999.